Templet for cutter-heads



(No Model.) 2 Sheds-Sheet l" S SHIMER.

TEMPLET' FOR CUTTER HEADS.

No. 573,304. Patented Dec. '15, 1896;

(No Model.) 2 Sheets-Shet 2. S. J. SHIMER.

1 TEMPLET FOR CUTTER HEADS. I No. 573,304. Patented Dec. 15, 1896 ihvirnn terns SAMUEL J. SIIIMER, OF MILTON, PENNSYLVANIA.

TEMPLET FOR CUTTER-HEADS.

SPECIFICATION forming part of Letters Patent No. 573,304, dat d De ember 15, 1896.

Application filed August 4, 1396.

To (LZZ whom it may concern:

Be it known that I, SAMUEL J. SHIMER, a citizen of the United States, and a resident of Milton, in the county of Northumberland and State of Pennsylvania, haveinvented certain new and useful Improvements in Templets for Cutter-Heads; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

My invention relates to templets for truing up the convex edges of planer-knivesused in connection with trapezoidal cutter heads, such as are shown in the Letters Patent granted to me March 3, 1896, No. 555,742. In

said patent there is shown a cutter-head having four trapezoidal sides alternately arranged and alternately inclined inward and outward with respect to the axial line of the head, in combination with blades formed with elliptical cutting edges so proportioned as to make the entire cutting edge of each knife lie within the surface of a cylinder of rotation, whereby they will cut chips diagonally in opposite directions from side to side across a plane board. In manufacturing such knives it requires great skill and calculation to so fashion the elliptical cutting edges thereof that they shall have the proper curvature with respect to the trapezoidal head to produce a true cut, and in practice it frequently happens that owing to long usage or other causes the cutting edges will wear unequally, rendering it necessary to employ a skilled workman to restore the cutting edge to the proper contour.

The object of the present invention is to provide a cutter-head of the above character with a removable templet, having a hardened elliptical face so proportioned as to lie within the surface of a cylinder of rotation and located in front of the cutting edge of the knife, thereby forming a guide for truing up the cutting edge. 7

. The invention consists in the novel con struction and combination of parts hereinafter fully described and claimed.

In the accompanying drawings, Figure 1 is a perspective View of a trapezoidal cutten Serial No. 601,655. (No model.)

head provided with a removable templet or guide construct-ed in accordance with my invention. Fig. 2 is an end view of the same. Fig. 3 is a perspective view of the templet removed from the head.

In the said drawings the referencen umeral 1 designates a trapezoidal cutter-head provided with a knife 2, secured thereto by bolts 3, as usual.

The numeral i designates a knife for cutting a plane surface, and 5 the knife-seat, which is beveled from end to end at 6, and the head in front of these beveled sides is formed with a longitudinal groove 8, in which is seated a rib 9 011 the under side of the templet 10. y This templet has its face convened on the line of the cylinder of rotation after the diagonally-inclined side of the planerhead, so that the knife-edge will be correspondingly convexed, whereby it will make a perfectly true out. At or near its center the templet is provided with a bolt-hole 12 to re ceive a screw-bolt 13, which engages with a registering screw-threaded hole to hold the templet in place on the head.

The numeral lat designates the templet for use in connection with knives for cutting molded surfaces.

I prefer to make the templet of iron or mild steel, so that its surface maybe case-hardened.

When the templet is secured to the cutter-head, the knife-edge may be trued up by means of a file.

Having thus fully described my invention, what I claim is 1. A templet or guide adapted to be removably secured to a trapezoidal cutter-head for determining the true cutting edge of a blade or knife secu red to said head, the face of which templet takes the convexity of a cylinder of rotation after the diagonally-inclined side of the cutter-head and provided on its inner side with a rib adapted to seat in. a corresponding groove in the cutter-head, substantially as described.

2. The combination with a rotatable cutterhead having trapezoidal or oppositely in clined sides, provided with knife-seats beveled from end to end, and the head in front of said beveled seats provided with a longitudinal groove, of the templet or guide having a rib on its under side seated in one of said grooves, and formed with a hardened elliptical face which takes the eonvexityof a cylinder of rotation after the diago11a1ly-inelined side of the head and the blade or blades secured to said sides of the cutterhead, substantially as described.

In testimony that I claim the foregoing as in y own I have hereunto aflixed my signature in presence of two witnesses.

SAMUEL J. SIIIMER.

\Vitnesses:

JOHN A. BECK, C. F. BALLIET. 

